Hello, new member here but I've been lurking for a month or so.
I'm remodeling the guest bathroom, I tore out the old tub & I am replacing it with a 3' X 5' shower stall. We're planning for a fixed shower head on the front wall over the valves & an additional, Rain shower head centered on the stall overhead.
On the advice of a local plumber I ran new 3/4" copper services from the main's, but the rough in valve I bought is 1/2". Its the only rough in valve that I could find that was a combo Thermostatic / 3 function diverter valve, but from all I can gather it only comes in 1/2"
Trim & Handles
Moen T4111 BN Kingsley Moentrol Shower Valve with Built-in Three Function Transfer Valve Trim - Brushed Nickel
Rough in Valve
Moen 3330 Moentrol Three Function Transfer Valve (1/2" CC)
My biggest question is, if I reduce my 3/4" services to 1/2" at the valve, will I have enough water pressure to run both shower heads.
The 3/4" to 1/2" reducer would be within 6" of the rough in valve, in order to get as much 3/4" volume & pressure as close to the valve as possible.
I've been looking for a 3/4" to 1/2" reducer that I could sweat directly to the rough in valve, but all I can come up with so far is the standard 3/4" X 1/2" reducer coupling.
1/2 copper: The flow rate is about 7.5 to 10gpm Plenty for up to 3 low flow shower heads. Restrictions in the heads are 2.5gpm is I remember correctly. Pressure can vary due to many factors. If you have good pressure, you should have plenty of flow for two heads running concurrently.